Database for the geologic map of the Frederick 30 x 60 quadrangle, Maryland, Virginia, and West Virginia
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The database for the geologic map of the Frederick 30 x 60 quadrangle covers the distinct geologic provinces and sections of the central Appalachian region that are...
弗雷德里克30×60四边形图幅（Frederick 30 x 60 quadrangle）地质图数据库，涵盖阿巴拉契亚中部区域的独特地质省与地质区段，其……
